Death metal sucks so Opeth can't be true death metal... 'cause they don't suck.
What is true death metal anyway? Opposite to false death metal?
What about stopping the bumpness?
Why is there even so such thing as 'genre'?
Many bands nowadays could fall into several categories, Opeth especially.
It's all just music to me now, with a hint of 'good' or 'bad' depending on the listener.
Heck, by the next album Opeth could be called a Motown band depending on what Mikael fancies dipping into.
I don't expect everyone to feel the same, but the sooner all this genre classification is done away with the better, to me anyway ofcourse.
I find genres very handy when i talk music with friends.